Code: 55003 / Network Security
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Time: 3hrs Total Marks: 100
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Note: 1. Question No. 1 is compulsory
2. Attempt any four out of remaining six questions
3. Ilustrate answers with sketches wherever required.
Q1.
a. What is cryptography? Compare Symmetric Key Cryptography and Asymmetric Key Cryptography. [10]
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b. Explain in detail PGP. [10]
Q2.
a. Explain Diffie Hellman key exchange protocol with a suitable example. [10] How can this mechanism be foiled by an attacker?
b. Explain different algorithm modes. [10]
Q3.
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a. Define network security? What are the services and mechanisms provided by network security? [10]
b. Give Comparison of MD5 and SHA-1. [10]
Q4.
a. What is Ticket Lifetime? Distinguish between Renewable Tickets and Postdated Tickets. [10]
b. Explain mutual authentication and reflection attack with the help of diagram. Suggest two methods to fix it. [10]
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Q5.
a. Explain SSL Architecture. [10]
b. What are the various types of Malware? Explain in detail [10]
Q6.
a. Explain working of Kerberos. How is Kerberos V5 different from V4? [10]
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b. Explain the security mechanism used on the electronic transactions [10]
Q7. Write short notes on any four [20]
a. Certificate Revocation.
b. Digital Signature
c. IPSec
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d. Biometrics
e. El-Gamal signatures
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